高温氦离子辐照对钨表面形貌的影响

doi:10.11901/1005.3093.2023.291

材料研究学报

2024, Vol. 38

Issue (6): 437-445 DOI: 10.11901/1005.3093.2023.291

研究论文

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高温氦离子辐照对钨表面形貌的影响

崔运秋, 牛春杰, 吕建骅, 倪维元, 刘东平, 鲁娜(

)

大连理工大学电气工程学院大连 116024

Effect of Helium Ions Irradiation at High Temperature on Surface Morphology of Tungsten

CUI Yunqiu, NIU Chunjie, LV Jianhua, NI Weiyuan, LIU Dongping, LU Na(

)

School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China

引用本文:

崔运秋, 牛春杰, 吕建骅, 倪维元, 刘东平, 鲁娜. 高温氦离子辐照对钨表面形貌的影响[J]. 材料研究学报, 2024, 38(6): 437-445.
Yunqiu CUI, Chunjie NIU, Jianhua LV, Weiyuan NI, Dongping LIU, Na LU. Effect of Helium Ions Irradiation at High Temperature on Surface Morphology of Tungsten[J]. Chinese Journal of Materials Research, 2024, 38(6): 437-445.

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摘要:

用He离子在高于2000 K的温度辐照高纯钨样品，研究了辐照参数对W表面形貌的影响。结果表明，在2300 K辐照后W样品的表面出现明显的氦泡生长引起的表面肿胀。随着氦离子剂量的提高氦泡破裂并产生表面孔洞，表面肿胀逐渐发展成交联的类似珊瑚状的钨丝状结构；随着离子能量的增大氦离子注入W样品的深度增大，促进了表面钨丝状结构的生长。辐照温度从2100 K提高到2400 K，表面自间隙钨原子的扩散增强，抑制了表面肿胀和钨丝状结构的生长，甚至使钨丝状结构退化。氦离子剂量和离子能量的增加都促进高温氦离子辐照后W材料表面钨丝状结构的产生和演变，而提高温度的影响则与其相反。

关键词 ：金属材料, 钨, 高温, 氦离子辐照, 表面形貌

Abstract：

Tungsten (W) is considered as one of the most promising plasma facing materials for fusion devices due to its excellent properties such as high melting point, high thermal conductivity, high sputtering threshold and low hydrogen isotope retention. In this study, high-purity tungsten blocks are irradiated by helium (He) ions at temperatures > 2000 K, and the effect of changes in irradiation parameters on the evolution of the W surface morphology is investigated. The results show that at 2300 K, the surface of the W samples shows a significant swelling morphology due to the growth of helium bubbles. As the ion fluence increases, the helium bubbles rupture, accompanied by the appearance of surface holes, and further surface swelling gradually develops into cross-linked coral-like tungsten nanofilament structures; With the increase of ion energy, the depth of helium ions injected into the W material increases, which promotes the growth of surface tungsten filament-like structures. When the temperature is changed from 2100 K to 2400 K, the temperature increase enhances the rapid diffusion of self-interstitial tungsten atoms on the surface, which leads to the suppression of the surface swelling and tungsten filament-like structure growth behavior, and even the degradation of the tungsten filament-like structure. The increase in both helium ion fluence and ion energy promotes the formation and evolution of tungsten filament-like structures on the surface of W materials after high-temperature He ion irradiation in the adopted range of experimental parameters, while the increase in temperature shows the opposite trend.

Key words： metallic materials tungsten high temperature He ions irradiation surface morphology

收稿日期: 2023-06-12

ZTFLH:

TG430.4

基金资助:国家重点研发计划(2017YFE0300106);中央高校基本科研经费(DUT20JC20);大连市科技之星项目(2020RQ136);中央指导辽宁省地方科技发展基金(2022010055-JH6/1001);中央高校基本科研经费(DUT21RC(3)066)

通讯作者: 鲁娜，教授，luna@dlut.edu.cn，研究方向为等离子与材料相互作用

Corresponding author: LU Na, Tel: 15504256218, E-mail: luna@dlut.edu.cn

作者简介: 崔运秋，女，1994年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.291 或 https://www.cjmr.org/CN/Y2024/V38/I6/437

图1 射频ICP离子源系统示意图

表1 He离子辐照实验的主要参数

图2 不同 He 离子剂量辐照后W样品表面的 SEM 照片

图3 离子剂量为4.0 × 1024 /m2时W样品表面氦泡的半径分布、对直方图的高斯拟合结果以及氦泡平均半径和数量密度与离子剂量的关系

图4 不同 He 离子能量辐照后W样品表面的SEM照片

图5 不同He离子剂量辐照后W样品表面的SEM照片

图6 不同温度He离子辐照后W样品表面的SEM照片

图7 不同He离子剂量辐照后W样品表面的SEM照片

图8 氢离子辐照后W样品表面的SEM照片

图9 W样品的质量损失与He离子剂量和He离子能量的关系

表2 不同 He 离子能量辐照后 W 样品的溅射率

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